Crank arm for a bicycle



FIG. 1 is a front elevational view of a crank arm for a bicycle showing my new design;

FIG. 2 is a right side elevational view thereof, the left side view being a mirror of that shown;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a crank arm for a bicycle, as shown and described. 